Fig. 1
Comparison of HMI magnetograms for each for the four Perihelia intervals (P1, P2, P3, and P4), which occurred during CR 2210, 2215, 2221, and 2226. Left column: original HMI synoptic maps, with the polar regions filled in. Middle column: processed magnetograms used to drive the polytropic and thermodynamic models, and right column: synoptic maps used to drive the WTD model. Blue/red corresponds to negative/positive polarities, respectively, and the maps have been saturated at ± 10 G; thus, some of the ARs such as during CR2215, contain field strengths larger than this maximum.
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